please help me with problem to mill a screw-retained bridge with Millbox

[gdcoper]

Hi there, I'm working a screw-retained denture, upper and lower, designed by Exocad. I sent the upper arch STL file to Millbox. Everything went well and it's milled. Despite milling the upper denture properly, it was unable to detect the Tibase cavity margin correctly. Tthe problem is when I'm trying to do my CAM software (Millbox) for lower arch, the software goes wrong and put the milling insertion direction from inside of the object to outside and also the margin of cavity of Tibase area, on the other side, on the entrance of screw channel access. If i try to mill that, the Tibase cavity and the screw channels wouldn't be milled.
Please help me how to fix the problem. Thanks

 

[Beldent Inc.]

Maybe you can turn your stl of 180 degres and import it back?
For the margin you can do manual margin!

look here at 7min15